Other World Computing announced a new memory kit for Apple's 2013 Mac Pro. This kit is compatible with 6-core, 8-core, and 12-core configurations and includes four 32-GB modules. As you'd expect, this is a pricy upgrade of $2130, but it's also not available from Apple.

For those doing an upgrade, OWC offers a rebate to exchange existing memory. So, you can order from Apple and get some money back on unused sticks of RAM. Or just sell it off.

Other World Computing also offers Mac Pro kits of 32 GB, 64 GB, and 96 GB. The company says their upgrades offer savings up up to 48% from Apple's pricing.